First implementation (#1)

Reviewed-on: #1

schemas/reference.schema.json

@@ -0,0 +1,73 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://paperspec.scient.ing/schemas/reference.schema.json",
+  "title": "Reference record",
+  "description": "One line of references.jsonl; spec/10-references.md.",
+  "type": "object",
+  "properties": {
+    "node": {
+      "$ref": "common.schema.json#/$defs/nodeId"
+    },
+    "label": {
+      "type": "string",
+      "minLength": 1
+    },
+    "csl": {
+      "type": "object"
+    },
+    "resolution": {
+      "oneOf": [
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "const": "doi"
+            },
+            "doi": {
+              "type": "string",
+              "pattern": "^10\\.[0-9]{4,9}/[^ ]+$"
+            }
+          },
+          "required": [
+            "type",
+            "doi"
+          ],
+          "additionalProperties": false
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "const": "document"
+            },
+            "doc": {
+              "$ref": "common.schema.json#/$defs/qualifiedKey"
+            }
+          },
+          "required": [
+            "type",
+            "doc"
+          ],
+          "additionalProperties": false
+        },
+        {
+          "type": "object",
+          "properties": {
+            "type": {
+              "const": "none"
+            }
+          },
+          "required": [
+            "type"
+          ],
+          "additionalProperties": false
+        }
+      ]
+    }
+  },
+  "required": [
+    "node",
+    "resolution"
+  ],
+  "additionalProperties": false
+}